hello don't know if this will help you decide or not, but i have a'66 with a 24 inch barrel in .44 spl.
i shot mine through my conograph last fall and the average velocity was 1050 fps.
the load i used was 200 grain lead bullet cast from a lee mould lubed with spg
around 25 grains of goex 3f and a cci large magnum pistol primer.
the conograph was set up 10 feet from the muzzle
just for a comparison my .45 colt out of my herny rifle also with a 24 inch barrel, was 1020fps.
that load was a .250 grain bullet cast from a lee mould, lubed with spg
around 30 grains of goex 3f and a cci large magnum pistol primer
conograph set up 10 feet from the muzzle
i don't have a 44wcf (yet
) but like steel horse said they are all real close and i would imagine a well place shot the critter would never know the difference. though i have target shot mine at 100yards i feel its a stretch for any of these calibers at that distance to give reliable killing power.
just my two cents worth. hope it helps